现有一段字符串，如apple,banana,orange,pears,grape，要把它按照逗号(,)分割成：
apple
banana
orange
pears
grape
然后使用where in()方法可以查询。
1、具体函数：
# 函数：func_split_TotalLength
DELIMITER $$
DROP functionIF EXISTS `func_split_TotalLength`$$
CREATE DEFINER=`root`@`%`FUNCTION `func_split_TotalLength`
(f_string varchar(1000),f_delimiter varchar(5))RETURNS int(11)
BEGIN
# 计算传入字符串的总length
return1+(length(f_string)-length(replace(f_string,f_delimiter,‘‘)));
END$$
DELIMITER;# 函数：func_split
DELIMITER $$
DROP functionIF EXISTS `func_split`$$
CREATE DEFINER=`root`@`%`FUNCTION `func_split`
(f_string varchar(1000),f_delimiter varchar(5),f_order int)RETURNS varchar(255)CHARSET utf8
BEGIN
# 拆分传入的字符串，返回拆分后的新字符串
declare result varchar(255)default‘‘;
setresult =reverse(substring_index(reverse(substring_index(f_string,f_delimiter,f_order)),f_delimiter,1));
returnresult;
END$$
DELIMITER;# 存储过程：splitString
DELIMITER $$
DROP PROCEDURE IF EXISTS `splitString`$$
CREATE PROCEDURE `splitString`
(IN f_string varchar(1000),IN f_delimiter varchar(5))
BEGIN
# 拆分结果
declare cnt intdefault0;
declare i intdefault0;
setcnt =func_split_TotalLength(f_string,f_delimiter);
DROP TABLE IF EXISTS `tmp_split`;
create temporary table `tmp_split`(`status`varchar(128)notnull)DEFAULT CHARSET=utf8;
whilei
do
seti =i +1;
insert intotmp_split(`status`)values (func_split(f_string,f_delimiter,i));
endwhile;
END$$
DELIMITER;
2、测试是否能成功分割
call splitString("apple,banana,orange,pears,grape",",");
select*fromtmp_split;
运行结果如下，说明分割成功：
mysql> call splitString("apple,banana,orange,pears,grape",",");
select * from tmp_split;
Query OK, 1 row affected
+--------+
| status |
+--------+
| apple |
| banana |
| orange |
| pears |
| grape |
+--------+
5 rows in set
mysql>
3、应用where in()查询
# 先传入字符串，分割后保存在临时表tmp_split中
call splitString("apple,banana,orange,pears,grape",",");
# 将查询的结果作为其他查询的条件来使用
select*fromfruit wherein(select*fromtmp_split);
原文：http://www.cnblogs.com/hyzhou/p/4511690.html